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The most common application of vacuum tubes is in amplifiers, especially in radio and television transmitters at power levels of more than 1 kW. Some high-fidelity audio systems also employ vacuum tubes. In recent years, tubes have gained favor with some popular music bands. Some musicians insist that tube amps provide richer sound than amplifiers using power transistors. There are two basic vacuum-tube amplifier circuit arrangements: the grounded-cathode configuration and the grounded-grid configuration.
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Grounded Cathode Figure 29-4 is a simplified schematic diagram of a grounded-cathode circuit using a triode tube. This circuit is the basis for many tube-type RF power amplifiers and audio amplifiers. The input impedance is moderate, and the output impedance is high. Impedance matching between the amplifier and the load can be obtained by tapping a coil in the output circuit, or by using a transformer. Grounded Grid Figure 29-5 shows a basic grounded-grid RF amplifier circuit. The input impedance is low, and the output impedance is high. The output impedance is matched by the same means as with the grounded-cathode arrangement. The grounded-grid configuration requires more driving (input) power than the grounded-cathode scheme. A grounded-cathode amplifier might produce 1 kW of
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29-4 Simplified schematic
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diagram of a grounded-cathode RF amplifier circuit using a triode tube.
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RF output for 10-W input, but a grounded-grid amplifier needs 50 W to 100 W of drive to produce 1 kW of RF output. A grounded-grid amplifier has a significant advantage, however: it is less likely to break into unwanted oscillation than a grounded-cathode circuit.
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Plate Voltage The plate voltages (+600 V dc) in the circuits of Figs. 29-4 and 29-5 are given as examples. The amplifiers shown could produce 75- to 150-W signal output provided they receive sufficient drive and are properly biased. An amplifier rated at 1-kW output would require a plate voltage of +2 kV dc to +5 kV dc. In high-power radio and TV broadcast transmitters producing in excess of 50-kW RF output, even higher dc plate voltages are used.
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Many TV receivers, and some desktop computer monitors, use cathode-ray tubes (CRTs). So do older oscilloscopes, spectrum analyzers, and radar sets.
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Electron Beam In a CRT, a specialized cathode called an electron gun emits an electron beam that is focused and accelerated as it passes through positively charged anodes. The beam then strikes a glass screen whose inner surface is coated with phosphor. The phosphor glows visibly, as seen from the face of the CRT, because of the effect of the high-speed electrons striking it.
29-5 Simplified schematic
diagram of a grounded-grid RF amplifier circuit using a triode tube.
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The beam scanning pattern is controlled by magnetic or electrostatic fields. One field causes the beam to scan rapidly across the screen in a horizontal direction. Another field moves the beam vertically. When complex waveforms are applied to the electrodes that produce the deflection of the electron beam, a display pattern results. This pattern can be the graph of a signal wave, a fixed image, an animated image, a computer text display, or any other type of visible image.
Electromagnetic CRT A simplified cross-sectional drawing of an electromagnetic CRT is shown in Fig. 29-6. There are two sets of deflecting coils, one for the horizontal plane and the other for the vertical plane. (To keep the illustration reasonably clear, only one set of deflecting coils is shown.) The greater the current in the coils, the greater the intensity of the magnetic field, and the more the electron beam is deflected. The electron beam is bent at right angles to the magnetic lines of flux. In an oscilloscope, the horizontal deflecting coils receive a sawtooth waveform. This causes the beam to scan, or sweep, at a precise, adjustable speed across the screen from left to right as viewed from in front. After each timed left-to-right sweep, the beam returns, almost instantly, to the left side of the screen for the next sweep. The vertical deflecting coils receive the waveform to be analyzed. This waveform makes the electron beam move up and down. The combination of vertical and horizontal beam motion produces a display of the input waveform as a function of time.
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